OK, I am swapping an AX-15/np 231 into my comanche. The truck originally had the BA 10 i believe as it was an 88. However I also swapped in a 89 motor from my donor comanche that had a auto trans. The AX-15 is from a 95 cherokee and has the external slave.

Question 1: what flywheel? Am I correct in saying that i need the Ba 10 flywheel as it has the same pickup as the (ring gear?) that came off the engine I am using?

Question 2: slave cylender. Do I need to find a clutch master from a jeep with an external ax 15 trans? And what do I use for the line. I do not have a line from either the BA 10 or the AX 15.

Question 3: Pilot bearing/bushing. I have ordered a clutch kit for a 95 cherokee already. The clutch fits onto the input shaft of the tranny and matches the old BA 10 clutch perfectly, as does the pressure plate. I have not tried to fit either the pilot bearing or bushing onto the engine crank yet. I am uncertain what do to as the engine was originaly mated to an auto trans and currently has neither.

If someone could help it would be appreciated, Ive browsed many AX-15 threads but have not been able to find my answers. I just want to make sure before I go on and run into more problems. TIA

I just found out about the 21 and 23 spline input x case shafts. I have a np 231 that was originally mated to the ax 15. That has a 23 spline input shaft. I also have what I think is a np 231 which was off of my auto trans and has 21 splines. I wanted to use the x case from the auto trans because that is the one that matches my axles and has the vacuum disconnect. Is their another option besides swapping the input shafts?

Also the pilot bearing. Why wont a New pilot/ bearing from a clutch kit for the trans donor vehicle work?

I just found out about the 21 and 23 spline input x case shafts. I have a np 231 that was originally mated to the ax 15. That has a 23 spline input shaft. I also have what I think is a np 231 which was off of my auto trans and has 21 splines. I wanted to use the x case from the auto trans because that is the one that matches my axles and has the vacuum disconnect. Is their another option besides swapping the input shafts?

Also the pilot bearing. Why wont a New pilot/ bearing from a clutch kit for the trans donor vehicle work?

The Renix 4.0l has an electronic crankshaft position sensor located on the left side of the transmission by the flywheel. This needs to read the marks on the original flywheel that came with that engine in order for the timing to be correct.

There is no other option than to swap the input shafts unless you want to run without the vacuum disconnect and run the manual 4wd disconnect (push pull cable).

The pilot bearing changes size many times from early years to later years. If I remember correctly the Renix 4.0 input is smaller than the H.O. 4.0 input. It may have an spacer/adapter in the driveshaft that comes out, but you'll have to research both individually to get correct information and order the correct pilot bearing.

The Renix 4.0l has an electronic crankshaft position sensor located on the left side of the transmission by the flywheel. This needs to read the marks on the original flywheel that came with that engine in order for the timing to be correct.

There is no other option than to swap the input shafts unless you want to run without the vacuum disconnect and run the manual 4wd disconnect (push pull cable)

The pilot bearing changes size many times from early years to later years. If I remember correctly the Renix 4.0 input is smaller than the H.O. 4.0 input. It may have an spacer/adapter in the driveshaft that comes out, but you'll have to research both individually to get correct information and order the correct pilot bearing.

Ok so im swapping the input shafts now and using the fly for the BA-10. I understand about the pilot bearing is the rumor a CJ (7 i think) will work

Ok, its been a while but ive made progress...some. Well i got the pilot bearing in, the one from the 95 cherokee worked. The clutch and everything fit and the trans is up. Now the mount i bought from rockauto is wrong. I tried to buy one locally, finally found a different one but totally wrong again. Tried the old BA-10 mount, no go. Did some research, from what i understand a 97 plus TJ mount will work?